This is a Half Single scrim for the Arri T24, 12/18K PAR, Fresnel, Ruby 7, or any other fixture that accepts a 29" accessory.
Full scrims dim the light across the entire beam spread, 1/2 and graduated scrims are used to even the beam spread when lighting a subject or background from an angle.
Keep several densities of scrims available, to be prepared for any lighting situation.